I'm installing a tub/shower combo in my bathroom. So far, I've had to tear out the existing greenboard in the alcove and get down to the joists to mount the new unit in. Everything is going well. Once I get the unit in, I'm going to have to install some new greenboard above the shower wall. I left a little bit of the existing wall in areas for now until I figure out how to join the walls together. The existing wall that's left is plaster over drywall.
The wall w/ the shower head is bare from floor to ceiling except for about a 2" area that I left hanging down from the ceiling.
The wall along the back side fo the tub is this way as well.
The wall opposite the shower head side is one long wall that extends from the alcove to the right side of the bathroom.
The first two walls I can replace totally. The third wall has existing tile that I'd like to leave, therefore I'd like to just seem this wall w/ my new greenboard.
Here is what I'm asking
1. When it comes to the wall ceiling corner, I originally thought to just score the plaster/drywall a bunch of times w/ a titanium blade and try to leave the ceiling 100% intact and just greenboard right up to the ceiling smoothly. However, there is a metal mesh corner piece in place which is starting to pull the ceiling apart a little as I work. How should I handle this?
2. How should I handle the seam along the existing wall. Is there a good way to cut the plaster over drywall nice and straight to match up the greenboard. It seems like tough stuff to cut.
3. when I do join the greenboard to the ceiling and the greenboard to the wall, is there anything I should do inparticular to make sure the seems are done properly.
Thanks a lot.